Method for locating fault through travelling wave natural frequencies at two ends of electric transmission line

Abstract

The invention discloses a method for locating a fault through the travelling wave natural frequencies at the two ends of an electric transmission line and belongs to the technical field of fault locating of electric transmission lines. According to the method for locating the fault through the travelling wave natural frequencies at the two ends of the electric transmission line, fault currents at the two ends of the electric transmission line are processed based on the atomic decomposition algorithm, main travelling wave natural frequency values at the two ends of the electric transmission line are determined based on atoms generated through iteration, the main travelling wave natural frequency values are corrected and calculated, the ratio of the length of a faulty line to the total line length is determined according to the inverse ratio of the corrected main travelling wave natural frequency values at the two ends of the electric transmission line, and therefore the position of a fault point is determined according to the distribution positions of poles and towers of the electric transmission line. By the adoption of the method for locating the fault through the travelling wave natural frequencies at the two ends of the electric transmission line, the main natural frequency value of the fault currents can be accurately determined, the fault locating precision is high, and a result is reliable.

Description

technical field [0001] The invention belongs to the technical field of transmission line fault location, and relates to a fault distance measurement method using the natural frequency of traveling waves at both ends of the transmission line. Background technique [0002] Accurate fault location of transmission lines is an important measure to ensure the safe and economical operation of the power grid, and it is a research difficulty and hotspot in the field of power systems. The existing fault location methods based on the natural frequency of traveling waves have high requirements on the identification accuracy of the main natural frequency of traveling waves, and there are serious problems in the location accuracy of single-phase faults and long-distance faults. At the same time, the existing traveling wave natural frequency fault location method only uses the electrical quantity at one end of the line to determine the location of the fault point, and the location result c...

AI Technical Summary

Problems solved by technology

At present, the existing fault location method based on the natural frequency of traveling wave has high requirements on the identification accuracy of the main natural frequency of traveling wave, and there is a problem that the location accuracy of single-phase fault and long-distance fault is seriously insufficient.

At the same time, the existing traveling wave natural frequency fault location method only uses the electrical quantity at one end of the line to determine the location of the fault point, and the location result cannot eliminate the influence of the line length by seasons and sags.

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